Electromagnetic apparatus



1646,234 0g. 18,1927. v F. GCREED ELECTROMAGNETIC APPARATUS Filed Marc6. 1925 2 Sheets-Sheet 1 Oct. 18; 1927.

,F. G. CREED ELECTROMAGNETICAPPARATUS Filed March 6, 1925 2 Sheets-Sheet2 Patented Oct. 18, 1927.

UNITED STATES 1,646,234 PATENT OFFICE.

FREDERICK GEQRGE GBEED, OI GBOYDON, ENGLAND.

ELECTROMAGNETIC .APPABA'IU S.

Application filed March 6, 1925, Serial ltd-18,474, and in Great BritainMarch 11, 1924.

This invention" relates-tocelectroma gnetic apparatus of the kinddescribed in the specification of former Letters Patent No.1,552,- 676,and which is specially suitable for use as a relay, switch, motor orlike device, and it v present invention. Figs. 4, and 6 are similarviews, to Figs. 1, 2 and 3 respectively, showing a modifiedconstruction.

In each of the examples shown, opposite- 1y and constantly polarizedmassive inverted U sha ed laminated pole pieces a and a are, accor ingto the present invention, fixed upon the upper ends of a non-magneticsupport or frame, formed, in the examples of two members 6, 6 adapted tobe carried by a base plate 2 and provided with a centrally arrangedvertical plate d, also of non-magnetic material,.=which may be made inc0118 piece with the frame, or,.-as shown, may be a separate plateinsertedth'rein and to which are secured upper and lower bearings e, eof which the upper one is readily removable. The laminated armature f,composed of stampings of magneticmaterial, some of which are extended atone end to form an at mature lever f as before, is fixed to a relativelylong vertical spindle 9" that extends through it and the upper and lowerends of which are adapted to form pivots g, g which extend into the saidupper and lower I bearings, the arrangement being such that ly arrangedvertical plate d, and are carried by the support or frame b, 6 either.directly, or, as shown, by the lower bearing e part of which extendsbelow the coil h and another part of which projects laterally throughthe vertical plate d and extends'below the coil.

h. The coils. are held in position vertically by the removable upperbearing e part of which extends over one coil h and another part ofwhich projects laterally through the vertical plate d and extends overthe other coil h. The coils are without spools or cores and thehorizontal hole through each of them, to accommodate the armature, is ofrectangular shape in cross section, as before,

and the sides thereof are arranged as close- 1y as possible to the sidesof the armature, but so as to admit of the necessary oscillation of thearmature, which however is of small extent. By arranging the inner sidesof the coils close to the armature as described, the maximum magnetizingeffect on the armature is obtainable with any given size of coil andvalue of electric current flowing therethrough; The ends of the coilsare conare magnetized by vertically arranged. U a

shaped permanent magnets j the upper ends of which bear closely againstthe said pole pieces and the lower horizontal and intermediate portionsof which extend through the non-magnetic support or frame b, b which ismade hollow or of an openwork character. Electro-magnetic apparatus asdescribed may be so constructed or arranged as to admit of relativeadjustment between the armature and the pairs of flat faces of the polepieces a, abetween which it works, to suit'requirement.

For this purpose, in the example shown in Figs. 1, 2 and 3, the two sidemembers I), b

of the hollow support or frame are fixed to I a. bottom plate I)provided at its lower side -with a, centrally arranged downwardlyextending plug is that pro'ects into a corresponding socket m extendingfrom'the lower side of the base plate a, and from opposite sides of thesupport or frame 6, I) extend two projections, formed in the exampleshown, by the ends n, n of a transverse bar, against one of which,namely n acts a coiled spring 0 supported at one end by a lug c as shownto receive tnem. The baseplate 0n the base plate 0 and against the otherof which, namely n, bears a horizontal adjustable screw 1' carried by abearing 0 on the base plate. The arrangement is such that by turning thescrew 1- in one direction or the other, the support or frame I), b andattached parts can be adjusted, under the con-.

trol of the spring 0, about a vertical axis that. is coincident with theaxis of the armature spindle g, in order to vary the position of thearmature in relation to the pole faces of the massive pole pieces a, awith which the armature co-operates. The plug is and attached parts can,by means of a screw 8 extending through the wall of the socket m andinto an annular groove 10 in the plug, be prevented from rising.

In the modified arrangement shown in Figs. 4, 5 and 6, the two par-ts b,b of the support or frame are fixed to a base plate 0 and upon'the part12 which is made Wide, is mounted a plate at carrying, on its upperside, insulated electric contacts u, u, or a contact and a stop, betweenwhich the armature lever f can work, and which, as shown, may be in theform of ad'ustable screws.

xThe plate I, which may be 0 circular shape,

in plan, is provided at one side with tubular lugs 'v, 12 through whichextends an end ways adjustable transversely arranged spindie w, one lug,namely a, being plain and encircling a plain portion of the spindle wand the other lug, namely, '0 being provided with a screwed lining '0that is pre vented from turning by means of a clam ing screw a and fitsa corresponding y screw threaded portion of the spindle w. The spindleis mounted to turn in bearings w, m that are carried by the part b ofthe support and one of which, namel w, is plain and the other, namelyan, screw t readed and fits a correspondingly screw-threaded 'portion ofthe spindle w, the two threadedportions of the spindle/having differentpitches.

'The arrangement is such that by turning the spindle win one directionor the other,

- ,by an amountcorresponding to the differ. ence in pitch of its screws,per revolution of the spindle o, and thus alter the position of thearmature in relation to the faces 'of the said pole pieces. The plate tcan be caused to bear firmly uponthe lateral extension I) by providingit at one side with a lever arm 3 to which is connected oneend of acoiled spring 2 the other end of which is connected ,tothe hollowsupport or frame 6,12

' endsof the armature coils h, h, the armature contacts 7' and f, orcontact, and the stationary contacts 10, u, or contact, may be connectedto terminals 1, fixed to the underside of the base plate a, which isrecessed,

the two pole pieces, and into said support,

a laminated armature extending through said coils and between the pairsof broad flat faces of the polar. projections of said pole pieces, thearmature having a lateral extension or lever arm, a vertical spindlefixed to said armature and extending therethrough between the coils ineach direction to omts above and below said coils, and stationarybearings for the upper and lower ends of said spindle. I

2. Electro-magnetic apparatus of the kind herein referred to, comprisingtwo oppositely arranged massive inverted U shaped laminated pole pieceshaving polar projections with broad flat faces, a non-magnetic hollowsupportfor said pole pieces, means for polarizing said pole pieces, astationary vertical plate of non-magnetic material arranged centrallywithin and carried by said support, upper and lower bearings carried bysaid plate, a vertical spindle having its end portion journalled in saidbearings, the upper of which is removable, a laminated armature arrangedhorizontally between the pairs of polar projections of said pole piecesand fixed to said spindle and an armature winding consisting of twostationary coils extending through the rectangular shaped openingsformed in the two pole pieces and arranged at o posite sides of saidplate and so as close y to surround the armature whilst leaving the samefree to oscillate to the desired extent.

3. Electro-magnetic apparatus of the kind herein referred to, comprisingtwo' oppositely arranged massive inverted U shaped laminated pole pieceshaving polar. projections with broad flat faces, a non-magnetic hollowsupport for said pole pieces, permanent magnets carried by said supportand arranged to permanently magnetize said pole pieces, a stationaryverticalv plate of nonmagnetic materialarranged cent-rally within andcarried bysaid support, upper and lower bearings carried by said plate,a vertical spindle having its end portions journalled in said bearings,the upper of which is removable, a laminated armature arrangedhorizontally between the .pairs' 01 polar projections of said polepieces and fixed to said spindle and an armaturewinding consisting oftwo stationary coils extending through the rectangular shaped "openingsformed in the two pole pieces and herein referred to, compnsing twoopposite- 1y arranged massive inverted U shaped laminated pole pieceshaving polar pro ections with broad flat faces, a non-magnetic supportfor said pole pieces, vertically arranged U shaped permanent magnets theupper ends of which closely embrace the said pole pieces and constantlypolarize them and the lower intermediate port ons 01' which extendthrough said non-magnetic support, an armature winding COI'lSlSi'lIlfIor a stationary pair of removable coils extending through therectangular shaped openings in the two pole pieces and into saidsupport, a laminated armature extending through said coils and betweenthe pairs 01 broad flat faces of the polar projections of said polepieces, the armature having a lateral extension or lever arm, a verticalspindle fixed to said armature and extending therethrough between thecoils in each direction to points above and below said coils. andstationary bearings for the upper and lower ends of said spindle.

6. In electro-magnetic apparatus according to claim 2, the combinationwith the armature and the pole pieces with which it co-operatcs, ofmeans whereby the normal relative positions of said armature and polepieces can be adjusted.

7. Electro-magnetic apparatus ofthekind referred to, comprising twooppositely arranged massive inverted U shaped laminated ole pieceshaving polar projections with hroad flat faces, a non-magnetic supportfor said pole pieces, means for magnetizing said pole pieces, anarmature. winding extending through the rectangular shaped openings insaid pole pieces and into said support, a laminated armature extendingthrough said winding and between the faces of the said polarprojections, a vertical spindle fixed to said armature, bearings forsaid spindle, a lever associated with said armature, devices betweenwhich said lever extends, and means for adjusting said device relativelyto said lever. a

8. Electro-magnetic apparatus ofthe kind referred to, comprising twooppositely ar-- ranged massive inverted U shaped laminated polepieces-having polar projections with broad flat faces, a non-magneticsupport for said pole pieces, means for magnetizing said pole pieces, anarmature winding extending through the rectangular shaped openings insaid pole pieces and into said support, a laminated armature extendingthrough said Winding and between the faces ofthe said polar projections,a vertical spindle fixed to said armature, bearings for said spindle, alever associated with said armature, devices for said devices, adaptedto, slide on said support in a direction substantially at right anglesto said lever and provided with lateral lugs one of which is providedwith an internal screw thread, hearings on said support one of which isprovided with an internal screw thread of a different pitch to that inthe said lug, and a rotary adjusting sp ndle extending through said lugsand bearings and provided with screw threads of difl'erent pitch adaptedto co-operate with 'those in the screw threaded lug and bearing,-

t'or the purpose set forth.

9. Electro-magnetic apparatus ofthekind referred to, comprising twooppositely arranged massive inverted U shaped laminated pole pieceshaving polar projections with broad flat faces, a non-magnetic supportfor said pole pieces, means for magnetizing said pole pieces, anarmature winding extending through the rectangular shaped openings'insaid pole pieces and into said support, a lam nated armature extendingthrough said winding and between the faces of the said polarprojections, a vertical spindle fixed to said armature, bearings forsaid spindle, a lever associated with said armature, devices betweenwhich said lever extends, a carrier for said device adapted to slide onsaid support in a direction substantially at right angles to said leverand providedwith lateral lugs one of which is provided with an in ternalscrew thread, hearings on said support one of which is provided with aninternal sc'rew thread of a different pitch to that in the said lug, arotary adjusting spindle extending through said In s and bearings andprovided with screw t reads of different pitch adapted to co-operatewith those in the screw threaded lug and bearing. a lever arm connectedto said carrier and adapted to turn about the axis of said spindle and aspring arranged to act on said lever arm and press said carrier againstthe part of the support on which it slides.

Signed at Croydon in the county of Surrey, England, this nineteenthdayof February, 1925.

FREDERICK GEORGE CREEtZL'Za between which said lever extends, a carrier

